$c:yellow;
div{
    width: 250px;
    height: 250px;
    background-color: $c;
}
span{
    color: $c;
}
h1{
    $b:tomato;
    color: $b;
  
}
ul{
    $a:red;
    color: $a;
}
a{
    $d:purple;
    color:$d;
    font-size: 22px;
}